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Cayenne Object Persistence Framework
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package org.apache.cayenne.graph;
import java.io.Serializable;
/**
* Represents a change in an object graph. This can be a simple change (like a node
* property update) or a composite change that consists of a number of smaller changes.
*
* @since 1.2
* @author Andrus Adamchik
*/
public interface GraphDiff extends Serializable {
/**
* Returns true if this diff is simply a placeholder and does not perform any actual
* operation.
*/
boolean isNoop();
/**
* Calls appropriate methods on the handler to "replay" this change.
*/
void apply(GraphChangeHandler handler);
/**
* Calls appropriate methods on the handler to revert this change.
*/
void undo(GraphChangeHandler handler);
}
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